Dunford, Nelson
Linear operators part 1: general history
John Wiley & Sons, 1976
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Dunford, Nelson
Linear operators part 2: spectral theory, self adjoint operators in Hilbert space
John Wiley & Sons, 1963
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Neerven, Jan van
The adjoint of a semigroup of linear operators
Springer-Verlag, 1992
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Dowson, H.R.
Spectral theory of linear operators
Academic Press, 1978
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Akhiezer, N.I.
Theory of linear operators in Hilbert space /N.I. Akhiezer and I.M. Glazman ; translated from the Russian by Merlynd Nestell.
Frederick Ungar Publishing Co, 1963
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